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IPv4 Subnet Calculator

Enter an IP with a CIDR prefix or a subnet mask to see its network, broadcast, host range, and host count. You can also split the network into smaller subnets.

$ ipcalc
Try:192.168.1.10/2410.0.0.0/8172.16.5.4/20203.0.113.9/29
IPv6 calculator →
private IP (RFC 1918)10.2.104.0/23
network10.2.104.0/23
broadcast10.2.105.255
first host10.2.104.1
last host10.2.105.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.2.104.0/23
address00001010.00000010.01101000.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.00000010.01101000.00000000
broadcast00001010.00000010.01101001.11111111
green = network part, grey = host part
hex0x0a026800
decimal167929856
reverse dns0.104.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:6800

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.2.104.0/2910.2.104.1 – 10.2.104.610.2.104.7
210.2.104.8/2910.2.104.9 – 10.2.104.1410.2.104.15
310.2.104.16/2910.2.104.17 – 10.2.104.2210.2.104.23
410.2.104.24/2910.2.104.25 – 10.2.104.3010.2.104.31
510.2.104.32/2910.2.104.33 – 10.2.104.3810.2.104.39
610.2.104.40/2910.2.104.41 – 10.2.104.4610.2.104.47
710.2.104.48/2910.2.104.49 – 10.2.104.5410.2.104.55
810.2.104.56/2910.2.104.57 – 10.2.104.6210.2.104.63
910.2.104.64/2910.2.104.65 – 10.2.104.7010.2.104.71
1010.2.104.72/2910.2.104.73 – 10.2.104.7810.2.104.79
1110.2.104.80/2910.2.104.81 – 10.2.104.8610.2.104.87
1210.2.104.88/2910.2.104.89 – 10.2.104.9410.2.104.95
1310.2.104.96/2910.2.104.97 – 10.2.104.10210.2.104.103
1410.2.104.104/2910.2.104.105 – 10.2.104.11010.2.104.111
1510.2.104.112/2910.2.104.113 – 10.2.104.11810.2.104.119
1610.2.104.120/2910.2.104.121 – 10.2.104.12610.2.104.127
1710.2.104.128/2910.2.104.129 – 10.2.104.13410.2.104.135
1810.2.104.136/2910.2.104.137 – 10.2.104.14210.2.104.143
1910.2.104.144/2910.2.104.145 – 10.2.104.15010.2.104.151
2010.2.104.152/2910.2.104.153 – 10.2.104.15810.2.104.159
2110.2.104.160/2910.2.104.161 – 10.2.104.16610.2.104.167
2210.2.104.168/2910.2.104.169 – 10.2.104.17410.2.104.175
2310.2.104.176/2910.2.104.177 – 10.2.104.18210.2.104.183
2410.2.104.184/2910.2.104.185 – 10.2.104.19010.2.104.191
2510.2.104.192/2910.2.104.193 – 10.2.104.19810.2.104.199
2610.2.104.200/2910.2.104.201 – 10.2.104.20610.2.104.207
2710.2.104.208/2910.2.104.209 – 10.2.104.21410.2.104.215
2810.2.104.216/2910.2.104.217 – 10.2.104.22210.2.104.223
2910.2.104.224/2910.2.104.225 – 10.2.104.23010.2.104.231
3010.2.104.232/2910.2.104.233 – 10.2.104.23810.2.104.239
3110.2.104.240/2910.2.104.241 – 10.2.104.24610.2.104.247
3210.2.104.248/2910.2.104.249 – 10.2.104.25410.2.104.255
3310.2.105.0/2910.2.105.1 – 10.2.105.610.2.105.7
3410.2.105.8/2910.2.105.9 – 10.2.105.1410.2.105.15
3510.2.105.16/2910.2.105.17 – 10.2.105.2210.2.105.23
3610.2.105.24/2910.2.105.25 – 10.2.105.3010.2.105.31
3710.2.105.32/2910.2.105.33 – 10.2.105.3810.2.105.39
3810.2.105.40/2910.2.105.41 – 10.2.105.4610.2.105.47
3910.2.105.48/2910.2.105.49 – 10.2.105.5410.2.105.55
4010.2.105.56/2910.2.105.57 – 10.2.105.6210.2.105.63
4110.2.105.64/2910.2.105.65 – 10.2.105.7010.2.105.71
4210.2.105.72/2910.2.105.73 – 10.2.105.7810.2.105.79
4310.2.105.80/2910.2.105.81 – 10.2.105.8610.2.105.87
4410.2.105.88/2910.2.105.89 – 10.2.105.9410.2.105.95
4510.2.105.96/2910.2.105.97 – 10.2.105.10210.2.105.103
4610.2.105.104/2910.2.105.105 – 10.2.105.11010.2.105.111
4710.2.105.112/2910.2.105.113 – 10.2.105.11810.2.105.119
4810.2.105.120/2910.2.105.121 – 10.2.105.12610.2.105.127
4910.2.105.128/2910.2.105.129 – 10.2.105.13410.2.105.135
5010.2.105.136/2910.2.105.137 – 10.2.105.14210.2.105.143
5110.2.105.144/2910.2.105.145 – 10.2.105.15010.2.105.151
5210.2.105.152/2910.2.105.153 – 10.2.105.15810.2.105.159
5310.2.105.160/2910.2.105.161 – 10.2.105.16610.2.105.167
5410.2.105.168/2910.2.105.169 – 10.2.105.17410.2.105.175
5510.2.105.176/2910.2.105.177 – 10.2.105.18210.2.105.183
5610.2.105.184/2910.2.105.185 – 10.2.105.19010.2.105.191
5710.2.105.192/2910.2.105.193 – 10.2.105.19810.2.105.199
5810.2.105.200/2910.2.105.201 – 10.2.105.20610.2.105.207
5910.2.105.208/2910.2.105.209 – 10.2.105.21410.2.105.215
6010.2.105.216/2910.2.105.217 – 10.2.105.22210.2.105.223
6110.2.105.224/2910.2.105.225 – 10.2.105.23010.2.105.231
6210.2.105.232/2910.2.105.233 – 10.2.105.23810.2.105.239
6310.2.105.240/2910.2.105.241 – 10.2.105.24610.2.105.247
6410.2.105.248/2910.2.105.249 – 10.2.105.25410.2.105.255
01 / table

IPv4 CIDR prefix table.

Click a prefix longer than your network to split it into subnets.

prefixsubnet maskaddresseshostsin your /23
/00.0.0.04,294,967,2964,294,967,294-
/1128.0.0.02,147,483,6482,147,483,646-
/2192.0.0.01,073,741,8241,073,741,822-
/3224.0.0.0536,870,912536,870,910-
/4240.0.0.0268,435,456268,435,454-
/5248.0.0.0134,217,728134,217,726-
/6252.0.0.067,108,86467,108,862-
/7254.0.0.033,554,43233,554,430-
/8255.0.0.016,777,21616,777,214-
/9255.128.0.08,388,6088,388,606-
/10255.192.0.04,194,3044,194,302-
/11255.224.0.02,097,1522,097,150-
/12255.240.0.01,048,5761,048,574-
/13255.248.0.0524,288524,286-
/14255.252.0.0262,144262,142-
/15255.254.0.0131,072131,070-
/16255.255.0.065,53665,534-
/17255.255.128.032,76832,766-
/18255.255.192.016,38416,382-
/19255.255.224.08,1928,190-
/20255.255.240.04,0964,094-
/21255.255.248.02,0482,046-
/22255.255.252.01,0241,022-
/23255.255.254.05125101
/24255.255.255.02562542 split →
/25255.255.255.1281281264 split →
/26255.255.255.19264628 split →
/27255.255.255.224323016 split →
/28255.255.255.240161432 split →
/29255.255.255.2488664 split →
/30255.255.255.25242128 split →
/31255.255.255.25422256 split →
/32255.255.255.25511512 split →
02 / faq

About this calculator.

How do I use this subnet calculator?

▼

Type an IP address followed by a prefix, like 192.168.1.10/24, or by a subnet mask, like 192.168.1.10 255.255.255.0. Without a prefix it uses /24. Click a row in the table to split the network into smaller subnets.

Why are usable hosts always 2 fewer?

▼

The first address in a subnet is the network address and the last is the broadcast address, so neither can go to a device. The exceptions are /31 (point-to-point links, RFC 3021) and /32 (a single address), which use every address.

Can I use it from a terminal?

▼

Yes. curl 'ipku.in/en/tools/ipv4-subnet-calculator?q=192.168.1.10/24' returns the result as plain text.

Learn how to work it out →